The word(s) "mercy" appears 151 time(s) in 147 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) And were it not for Allah's grace upon you and His mercy a party of them had certainly designed to bring you to perdition and they do not bring (aught) to perdition but their own souls, and they shall not harm you in any way, and Allah has revealed to you the Book and the wisdom, and He has taught you what you did not know, and Allah's grace on you is very great.

(22) Then as for those who believe in Allah and hold fast by Him, He will cause them to enter into His mercy and grace and guide them to Himself on a right path.

(23) Say: To whom belongs what is in the heavens and the earth? Say: To Allah; He has ordained mercy on Himself; most certainly He will gather you on the resurrection day-- there is no doubt about it. (As for) those who have lost their souls, they will not believe.

(24) He from whom it is averted on that day, Allah indeed has shown mercy to him; and this is a manifest achievement.

(25) And when those who believe in Our communications come to you, say: Peace be on you, your Lord has ordained mercy on Himself, (so) that if any one of you does evil in ignorance, then turns after that and acts aright, then He is Forgiving, Merciful.

(26) And your Lord is the Self-sufficient one, the Lord of mercy; if He pleases, He may take you off, and make whom He pleases successors after you, even as He raised you up from the seed of another people.

(27) But if they give you the lie, then say: Your Lord is the Lord of All-encompassing mercy; and His punishment cannot be averted from the guilty people.

(28) Again, We gave the Book to Musa to complete (Our blessings) on him who would do good (to others), and making plain all things and a guidance and a mercy, so that they should believe in the meeting of their Lord.

(29) And this is a Book We have revealed, blessed; therefore follow it and guard (against evil) that mercy may be shown to you.

(30) Or lest you should say: If the Book had been revealed to us, we would certainly have been better guided than they, so indeed there has come to you clear proof from your Lord, and guidance and mercy. Who then is more unjust than he who rejects Allah's communications and turns away from them? We will reward those who turn away from Our communications with an evil chastisement because they turned away.